Definition of "greywater" [greywater]

• Alternative spelling of gray water. (noun)

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• "Rethinking regulation of rainwater and greywater is going to have to happen, but an even bigger negative impact on our water usage is from food."
• "I want to be known for harvesting "greywater" -- or at the very least knowing what it is (water that's been used once but is still clean enough for other jobs)."
• "It is also called greywater (to distinguish it from blackwater which describes wastes containing human excreta)."